The ceiling tiles are in a dry cleaning shop outside Chicago.  Everybody likes them, even the building inspectors!  There were drop ceiling tiles already in place - dirty and yellowed - I just painted the grids and inserted the Ceilume under the mineral fiber panels. Some had to be stapled together but it was worth it. In a dry cleaners, the humidity and dust yellow up the fiber panels quickly, with yours, I can clean as needed and the panels look especially good with the T-8 lights.